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鹽霧測試機的種類及試驗步驟
日期:2024-10-04 16:16
瀏覽次數:2038
摘要:
鹽霧測試機的種類及試驗步驟
1、鹽霧試(shi)驗簡述:
1、鹽霧試(shi)驗簡述:
鹽霧(wu)試驗(yan)是一種(zhong)主要(yao)利用鹽霧試驗設備所創造的(de)人(ren)(ren)工模擬鹽(yan)(yan)(yan)霧(wu)環(huan)(huan)(huan)境(jing)(jing)條(tiao)件來(lai)(lai)考核產品或金(jin)屬材(cai)料耐(nai)腐(fu)蝕性(xing)(xing)能的(de)環(huan)(huan)(huan)境(jing)(jing)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)。它(ta)分為(wei)二大(da)類(lei),一(yi)(yi)類(lei)為(wei)天(tian)(tian)然(ran)環(huan)(huan)(huan)境(jing)(jing)暴露(lu)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan),另一(yi)(yi)類(lei)為(wei)人(ren)(ren)工加速(su)模擬鹽(yan)(yan)(yan)霧(wu)環(huan)(huan)(huan)境(jing)(jing)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)。人(ren)(ren)工模擬鹽(yan)(yan)(yan)霧(wu)環(huan)(huan)(huan)境(jing)(jing)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)是利用一(yi)(yi)種具有一(yi)(yi)定容積(ji)空(kong)間的(de)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)設(she)備——鹽(yan)(yan)(yan)霧(wu)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)箱,在(zai)其(qi)容積(ji)空(kong)間內用人(ren)(ren)工的(de)方法,造成鹽(yan)(yan)(yan)霧(wu)環(huan)(huan)(huan)境(jing)(jing)來(lai)(lai)對產品的(de)耐(nai)鹽(yan)(yan)(yan)霧(wu)腐(fu)蝕性(xing)(xing)能質(zhi)量進(jin)行(xing)考核。它(ta)與天(tian)(tian)然(ran)環(huan)(huan)(huan)境(jing)(jing)相(xiang)比,其(qi)鹽(yan)(yan)(yan)霧(wu)環(huan)(huan)(huan)境(jing)(jing)的(de)氯化物的(de)鹽(yan)(yan)(yan)濃(nong)度,可以是一(yi)(yi)般天(tian)(tian)然(ran)環(huan)(huan)(huan)境(jing)(jing)鹽(yan)(yan)(yan)霧(wu)含量的(de)幾倍或幾十倍,使腐(fu)蝕速(su)度大(da)大(da)提高,對產品進(jin)行(xing)鹽(yan)(yan)(yan)霧(wu)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan),得(de)(de)出(chu)結果的(de)時(shi)間也(ye)大(da)大(da)縮短。如(ru)在(zai)天(tian)(tian)然(ran)暴露(lu)環(huan)(huan)(huan)境(jing)(jing)下對某(mou)產品樣(yang)品進(jin)行(xing)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan),待其(qi)腐(fu)蝕可能要1年,而在(zai)人(ren)(ren)工模擬鹽(yan)(yan)(yan)霧(wu)環(huan)(huan)(huan)境(jing)(jing)條(tiao)件下試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan),只要24小時(shi),即(ji)可得(de)(de)到相(xiang)似的(de)結果。人(ren)(ren)工模擬鹽(yan)(yan)(yan)霧(wu)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)又包括中性(xing)(xing)鹽(yan)(yan)(yan)霧(wu)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)、醋酸鹽(yan)(yan)(yan)霧(wu)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)、銅鹽(yan)(yan)(yan)加速(su)醋酸鹽(yan)(yan)(yan)霧(wu)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)、交變鹽(yan)(yan)(yan)霧(wu)試(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)。
2、鹽霧試驗的種類:
(1) 中(zhong)性(xing)鹽霧試(shi)驗(NSS試(shi)驗)是出(chu)現(xian)*早目前應(ying)用領(ling)域*廣的(de)一種加速腐蝕試(shi)驗方法。它采用5%的(de)氯化鈉(na)鹽水溶(rong)(rong)液,溶(rong)(rong)液PH值調在中(zhong)性(xing)范圍(6~7)作為噴霧用的(de)溶(rong)(rong)液。試(shi)驗溫(wen)度均取35℃,要求(qiu)鹽霧的沉降率在(zai)1~2ml/80cm2.h之間。
(2) 醋酸鹽(yan)霧(wu)試(shi)驗(yan)(ASS試(shi)驗(yan))是在中性(xing)(xing)鹽(yan)霧(wu)試(shi)驗(yan)的(de)基礎(chu)上發展(zhan)起來的(de)。它是在5%氯化鈉溶液(ye)中加入一些(xie)冰(bing)醋酸,使溶液(ye)的(de)PH值降為3左右,溶液(ye)變成酸性(xing)(xing),*后形(xing)成的(de)鹽(yan)霧(wu)也由中性(xing)(xing)鹽(yan)霧(wu)變成酸性(xing)(xing)。它的(de)腐蝕速度要比(bi)NSS試(shi)驗(yan)快(kuai)3倍左右。
(3) 銅(tong)鹽(yan)加(jia)速醋酸鹽(yan)霧(wu)試(shi)驗(yan)(CASS試(shi)驗(yan))是國外新近發展起來的一種快速鹽(yan)霧(wu)腐蝕試(shi)驗(yan),試(shi)驗(yan)溫度(du)為50℃,鹽溶液中加入(ru)少量銅鹽—氯化銅,強(qiang)烈誘(you)發腐(fu)(fu)蝕。它的腐(fu)(fu)蝕速度大約是NSS試驗的8倍。
3、各種鹽霧試驗的試驗方法:
中(zhong)性鹽(yan)霧試驗(yan)(NSS)
中(zhong)性鹽霧試驗是(shi)加速(su)腐蝕試驗的(de)(de)一(yi)種方(fang)法,是(shi)在專用(yong)的(de)(de)鹽霧箱中(zhong)進行的(de)(de).適用(yong)于鋼(gang)鐵件上的(de)(de)鍍(du)鋅,鍍(du)鎘(ge),氧化和(he)磷化等鍍(du)覆層的(de)(de)耐蝕性檢驗。
中(zhong)性鹽霧試(shi)驗(yan)配制的鹽水為(wei)5%的NaCl溶液,PH為(wei)6.5~7.2,箱中(zhong)溫度為(wei)35±2C,相(xiang)對濕度為(wei)95%以上。
中(zhong)性(xing)鹽(yan)霧試驗噴霧沉降為1mL~2Ml/80cm/h,收(shou)集的鹽(yan)霧NaCl濃度應為5±1%, PH為6.5~7.2,噴嘴壓強應為0.07MPa~0.1 Mpa.
4、中性鹽霧試驗的步驟:
(1) 采用有機溶劑(ji)清(qing)洗試樣表面,使試樣表面無(wu)油污和其他(ta)對鍍層(ceng)具有腐蝕的物(wu)品(pin)。
(2) 將試(shi)片置于(yu)鹽霧箱中,試(shi)片受試(shi)面(mian)朝(chao)上(shang)與垂(chui)直線成15~30℃。
(3) 按(an)檢驗周期規(gui)定進行鹽霧試(shi)驗。
(4) 取出(chu)試樣用(yong)流動(dong)水輕(qing)輕(qing)沖洗或用(yong)海(hai)綿帶水輕(qing)輕(qing)擦拭表面除(chu)去鹽沉積物,然后在80C~ 100C干燥30min左右(you)。
(5) 對試樣的腐蝕(shi)等級(ji)給予評判。.
東莞市高達檢測儀器有限公司生產銷售鹽霧試驗機,恒溫恒濕試驗機歡迎前來咨詢訂購